Perforating-machine.



H. DREWELL.

PERFORATING MACHINE.

APPLICATION msn SEPT. 17. 1913.

1,1 90,736. Patented July 11, 1916.

HEINRICI-I'DREWELL, OF CHARLOTTENBURG, GERMANY.

PERFORATING-IVIACHINE.

Specification of Letters Patent.

Patented July 11, 19916.

Application filed September 1'7, 1913. Serial No. 790,218. l

To all whom it may concern.'

Be it known that I, HEINRICH DREWELL, a subject of the German Emperor, residing at Charlottenburg, Germany, have invented new and useful Improvements in Perforating-Machines, of which the following is a specification.

My invention relates to devices for driving the bands in register-band perforatingmachines which are employed in setting type, telegraphing, and so on. Such bands are inserted into the machine in the form of large stock rolls. rIhe very rapid intermittent feed of the band occasioned by the mode of operation of the machine causes difliculties, however, because the inertia of the roll impairs the uniformity of the steps in which the band is fed. In order to obviate this defect devices have heretofore been proposed in which the band is unwound from the stock roll by means of a special driving device which is actuated by means of a readily engaged clutch or by means of electric contact devices.

A primary object of my invention is to provide an improved device for unwinding the band from the stock roll which is simpler than devices heretofore employed. 'Io this end, I provide an auxiliary driving device which requires no special clutch in order to be set working. @n the contrary, owing to the continuously running friction rollers which I employ. the operation of my auxiliary driving device is regulated directly by the tension of the band, the employment of additional intermediate members being dispensed with.

One embodiment of my invention is represented by way of example in the accompanying drawing, wherein one preferred form of apparatus according to my invention is represented in elevation.

Referring to the drawing, the perforated band is inserted into the machine in the form of a large stock roll 1 on a pin 2 in such manner that the roll can readily rotate about the pin. The band 3 is led from the roll 1 over a friction roller 4, then over a second friction roller 5. and then through av system of transverse ribs 6 and 7 into the gap between the matrix 8 and the punches 9. The band then goes through a step-bvstep feeding device consisting of two rubber-covered feed rollers 10 and 11. the former being carried by an axle 12 which is fed rounds an eccentric 18. The purpose of the friction rollers 4 and 5 is to facilitate the unwinding of the band 3 from the roll 1 and to prevent unequal steps being produced owing to the heavy mass of the roll when the band is fed step by step. To this end, the two friction rollers 4 and 5 are constantly driven. The roller 5 is mounted directly on the lengthened axle 20 of the mo tor 21. In proximity to this roller 5 on the same axle is mounted a gear wheel 22 which meshes with a gear wheel 23 rigidly conneeted with the roller 4.

As long as the motor 2l runs and the ma chine is working the rollers 4 and 5 rotate. 'Ihey drive the band so far that it lies loosely on the roller 4 and hangs below the roller 5. As soon as the band is subjected to tension owing to its being fed step by step by means of the feed rollers 10 and 11, and the band bears firmly against the rollers 4 and 5, in consequence of its friction with these rollers the band is powerfully fed forward and unwound from the roll 1. rIhe rollers 4, 5, 10 and 11 are preferably covered with indiarubber or with a similar mass which produces sufficient friction with the band. The roller 11 is pressed by springs of suitable strength against the roller 10 in order to insure that the band is certainly drawn forward. Instead 'of the two friction rollers 4 and 5 I may employ only one. I'may however employ three or more constantly rotating friction rollers for the automatic operation of ltype-setting or line-casting machines, the combination of intermittently driven feed rollers, an escapement device, an eccentric operating said escapement device and driving said feed rollers, a member carrying a stock roll of band, the band passing between said feed rollers and lapping said friction rollers and being adapted to be transferred by said friction rollers when put under tension by said l@ feed rollers.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HEINRICH DREVVELL.

Witnesses:

VOLDEMAR HAUPT, HENRY HAsPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, WashingtomD. C. 

